[PATCH V5 00/12] add clock driver for Spreadtrum platforms

From: Chunyan Zhang
Date: Mon Nov 20 2017 - 01:10:43 EST

This series adds Spreadtrum clock support together with its binding
documentation and devicetree data.

Any comments would be greatly appreciated.

This patchset also added a few common clock mactos into drivers/clk/clk_common.h,
which are generally useful for all vendors' clock driver, sunxi-ng, zte, sprd
(added in this patchse) use them (or part of them) at present, once this patchset
is merged, I can help to remove the duplicated code which is under the vendors'
respective directories.


Changes from V4: (https://www.spinics.net/lists/arm-kernel/msg616566.html)
* Added Rob's Acked-by;
* Removed spin lock from Spreadtrum's gate, mux, div drivers, since we have
switched to use regmap.

Changes from V3: (https://lkml.org/lkml/2017/11/2/61)
* Addressed comments from Julien Thierry:
- Clean the if branch of sprd_mux_helper_get_parent()
- Have the Gate clock macros and ops for both mode (i.e. sc_gate and gate) separate;
- Have the Mux clock macros with/without table separate, and same changes
for the composite clock.
* Switched the function name from _endisable to _toggle;
* Fixed Kbuild test error:
- Added exporting sprd_clk_regmap_init() which would be used in other module(s);
* Change the function sprd_clk_set_regmap() to the static one, and removed the
declear from the include file;
* Addressed comments from Rob:
- Separate the dt-binding include file from the driver patch;
- Documented more for the property "clocks"
* Changed the syscon device names;
* Changed the name of 'sprd_mux_internal' to 'sprd_mux_ssel'

Changes from V2: (http://lkml.iu.edu/hypermail/linux/kernel/1707.1/01504.html)
* Switch to use regmap to access registers;
* Splited all clocks into 16 separated nodes, for each belongs to a single address area;
* Rearranged the order of clock declaration in sc9860-clk.c, sorted them upon the address area;
* Added syscon device tree nodes which will be quoted by the node of clocks which are in
the same address area with the syscon device;
* Revised the binding documentation according to the dt modification.

Changes from V1: (https://lkml.org/lkml/2017/6/17/356)
* Address Stephen's comments:
- Switch to use platform device driver instead of the DT probing mechanism.
- Move the common clock macro out from vendor directory, but need to remove those
overlap code from other vendors (such as sunxi-ng) once this get merged.
- Add support to be built as a module.
- Add 'sprd_' prefix for all spin locks used in these drivers.
- Mark input parameter of sprd_x with const.
- Remove unreasonable dependencies to CONFIG_64BIT.
- Add readl() after writing the same register.
- Remove CLK_IS_BASIC which is no longer used.
- Remove unnecessery CLK_IGNORE_UNUSED when defining a clock.
- Change to expose all clock index.
- Use clk_ instead of ccu.
- Add Kconfig for sprd clocks.
- Move the fixed clocks out from the soc node.
- Switch to use 64-bit math in pll driver instead of 32-bit math.
* Revise binding documentation according to dt modification.
* Rename sc9860.c to sc9860-clk.c

Chunyan Zhang (12):
drivers: move clock common macros out from vendor directories
clk: sprd: Add common infrastructure
clk: sprd: add gate clock support
clk: sprd: add mux clock support
clk: sprd: add divider clock support
clk: sprd: add composite clock support
clk: sprd: add adjustable pll support
dt-bindings: Add Spreadtrum clock binding documentation
clk: sprd: Add dt-bindings include file for SC9860
clk: sprd: add clocks support for SC9860
arm64: dts: add syscon for whale2 platform
arm64: dts: add clocks for SC9860

Documentation/devicetree/bindings/clock/sprd.txt | 63 +
arch/arm64/boot/dts/sprd/sc9860.dtsi | 115 ++
arch/arm64/boot/dts/sprd/whale2.dtsi | 48 +-
drivers/clk/Kconfig | 1 +
drivers/clk/Makefile | 1 +
drivers/clk/clk_common.h | 60 +
drivers/clk/sprd/Kconfig | 14 +
drivers/clk/sprd/Makefile | 11 +
drivers/clk/sprd/common.c | 113 ++
drivers/clk/sprd/common.h | 53 +
drivers/clk/sprd/composite.c | 62 +
drivers/clk/sprd/composite.h | 53 +
drivers/clk/sprd/div.c | 92 +
drivers/clk/sprd/div.h | 77 +
drivers/clk/sprd/gate.c | 113 ++
drivers/clk/sprd/gate.h | 61 +
drivers/clk/sprd/mux.c | 78 +
drivers/clk/sprd/mux.h | 76 +
drivers/clk/sprd/pll.c | 268 +++
drivers/clk/sprd/pll.h | 110 ++
drivers/clk/sprd/sc9860-clk.c | 1987 ++++++++++++++++++++++
include/dt-bindings/clock/sprd,sc9860-clk.h | 408 +++++
22 files changed, 3862 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/clock/sprd.txt
create mode 100644 drivers/clk/clk_common.h
create mode 100644 drivers/clk/sprd/Kconfig
create mode 100644 drivers/clk/sprd/Makefile
create mode 100644 drivers/clk/sprd/common.c
create mode 100644 drivers/clk/sprd/common.h
create mode 100644 drivers/clk/sprd/composite.c
create mode 100644 drivers/clk/sprd/composite.h
create mode 100644 drivers/clk/sprd/div.c
create mode 100644 drivers/clk/sprd/div.h
create mode 100644 drivers/clk/sprd/gate.c
create mode 100644 drivers/clk/sprd/gate.h
create mode 100644 drivers/clk/sprd/mux.c
create mode 100644 drivers/clk/sprd/mux.h
create mode 100644 drivers/clk/sprd/pll.c
create mode 100644 drivers/clk/sprd/pll.h
create mode 100644 drivers/clk/sprd/sc9860-clk.c
create mode 100644 include/dt-bindings/clock/sprd,sc9860-clk.h